Barlmoth The Destroyer

Living Shadow: While the dragon is in dim light or darkness it has resistance to damage that isn’t force, psychic, or radiant.

Shadow Lord: The dragon’s presence can distort non magical light, causing bright light to become dim and dim light to become darkness within five miles of it.

Staffing: The dragon can use its movement simultaneously with its breath weapon, adding its movement to the length of the breath.

Sunlight Sensitivity: While in direct sunlight, the dragon can no longer regenerate, all attack rolls against it have advantage, and it’s attacks have disadvantage.

Legendary Resistance (5/Day). If the dragon fails a saving throw, it can choose to succeed instead.

Regeneration: The dragon regenerates 33 hit points at the start of it’s turn provided it has at least one and is not in direct sunlight.

Innate Spellcasting: The dragon’s innate spellcasting ability is charisma (save DC 25, + 17 to hit with spell attacks).

At Will: Darkness, Invisibility, Dimensional Door, Lightning Bolt, Polimorph, Call Lightning.

7/day: Destructive Wave, Armor Of Agathys (cast at 5th level), Dominate Person, Shield.

5/day: Physical Mirror, Heal, Sunfire, Teleport, Globe Of Invulnerability.

3/day: Anti-magic Field, Power Word Stun, Horrid Wilting, Dark Star.

1/day each: Elemental Havoc, Meteor Swarm, Power Word Heal.

Multiattack. The dragon can use its frightful presence. It then makes five attacks: one with its bite, two with its claws, one with it’s wings, and one with its tail.

Bite. Melee Weapon Attack: +19 to hit, reach 15 ft., one target. Hit: (3d10+10) slashing damage plus (5d6) necrotic damage.

Claw. Melee Weapon Attack: +19 to hit, reach 10 ft., one target. Hit: (3d8+10) plus (3d6) necrotic damage.

Tail. Melee Weapon Attack: +19 to hit, reach 30 ft., one target. Hit: (3d12+10) plus (6d6) fire.

Wing Attack. The dragon beats its wings. Each creature within 30 feet of the dragon must succeed on a DC 25 Dexterity saving throw or take 13 (3d6 + 10) bludgeoning damage and (5d6) fire damage and be knocked prone. The dragon can then fly up to half its flying speed.

Fire Breath (Recharge 4–6). The dragon exhales in a 30-foot cone. Each creature in that area must make a DC 25 Dexterity saving throw, taking (33d6) fire or necrotic (dragon’s choice) damage on a failed save, or half as much damage on a successful one. If it chooses necrotic, creatures slain by the dragon rise as shadows the next turn.

 Eelemental Shard (Recharge 4-6): The dragon conjures up to three giant shard of ice, fire, acid, lightning, or force, and shoots them up to 600 feet. All creatures in a 15 foot radius of where one impacts must make a dexterity saving throw or take 10d6 bludgeoning and 10d6 of the chosen damage type, taking half damage on a save success. A large or smaller creature can be affected by only one shard, while a huge creature can be affected by 2 and a gargantuan creature can be affected by three.

The dragon can take 5 legendary actions, choosing from the options below. Only one legendary action option can be used at a time and only at the end of another creature's turn. The dragon regains spent legendary actions at the start of its turn.

Detect. The dragon makes a Wisdom (Perception) check.

Tail Attack. The dragon makes a tail attack.

Wing Attack (Costs 2 Actions). The dragon makes one wing attack.

Spell (Costs 3 Actions). The dragon uses its elemental shard attack with only one shard, or casts one spell that it knows.